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Visualization of pre-set vortices in boundary layer flow over wavy surface in rectangular channel

Budiman, AC; Mitsudharmadi, H; Bouremel, Y; Winoto, SH; Low, HT; (2015) Visualization of pre-set vortices in boundary layer flow over wavy surface in rectangular channel. Journal of Visualization , 18 (4) pp. 669-677. 10.1007/s12650-014-0252-z. Green open access

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Abstract

Smoke-wire flow visualization is used to study the development of pre-set counter-rotating streamwise vortices in boundary layer flow over a wavy surface in a rectangular channel. The formation of the vortices is indicated by the vortical structures on the cross-sectional plane normal to the wavy surface. To obtain uniform spanwise vortex wavelength which will result in uniform vortex size, two types of spanwise disturbances were used: a series of perturbation wires placed prior and normal to the leading edge of the wavy surface, and a jagged pattern in the form of uniform triangles cut at the leading edge. These perturbation wires and jagged pattern induce low-velocity streaks that result in the formation of counter-rotating streamwise vortices that evolve downstream to form the mushroom-like structures on the cross-sectional plane of the flow. The evolution of the most amplified disturbances can be attributed to the formation of these mushroom-like structures. It is also shown that the size of the mushroom-like structures depends on the channel entrance geometry, Reynolds number, and the channel gap. Graphical Abstract: [Figure not available: see fulltext.]

Type: Article
Title: Visualization of pre-set vortices in boundary layer flow over wavy surface in rectangular channel
Open access status: An open access version is available from UCL Discovery
DOI: 10.1007/s12650-014-0252-z
Publisher version: http://doi.org/10.1007/s12650-014-0252-z
Language: English
Additional information: © The Visualization Society of Japan 2014. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Counter-rotating streamwise vortices; Wavy surface; Boundary layer flow; Triangular pattern leading edge; Smoke-wire flow visualization; Flow instability
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > Institute of Ophthalmology
URI: https://discovery.ucl.ac.uk/id/eprint/1527661
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